SOHC.co.uk Forums > Project Board
Lets build a SOHC for less than a grand
Trigger:
Thank you for the link eight0. I had read it but, what I have found is there are so many different fork bottoms on the 550's and 750's that you should never assume yours will be the same.
I used a cut away early hub but, I could not understand the speedo drive for it. The one I have will not sit in the cut away and the drive would not go in to the ID of the disc.
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Trigger:
And finally the disc centre hole :o If you do the maths from the pictures, nothing adds up.
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Trigger:
When I was trying to line everything up, I was doing one of the biggest mistakes as an engineer. I was reading loads of articles on how to do a double disc conversion and not taking in to account the two different hubs and all the different fork bottoms.
The article in Blacksquare said that you should have a 3mm gap on the top mount of the pivot. I was getting 2.564mm so, got a load of old fork bottoms out to compare and in the end I came up with 3 different gaps over 4 different fork bottoms.
3 hours later after a load of measuring from a datum line, I finally got it right :o
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Bryanj:
When i get home next week Trigger i will measure the nos early drive i have, when i did mine i hotched out the inner hole in the disc carrier to make rectangular holes for the tangs, i could have ground the tangs to an ellipse shape instead.
Trigger:
--- Quote from: Oddjob on January 12, 2020, 08:04:08 PM ---As for the speedo drive thing, are you sure that's not an original drive with the prongs folded down? they were flat originally and used the chrome dish to secure them to the hub so it wouldn't fit inside the disc as it was never meant too.
--- End quote ---
The flat tabbed one is cupped and is in a picture on page 2 of this thread. I don't have another original to compare ;)
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